Input System Package + Raycasting (Unity)

z4gon
z4gon

Using Input Action events to Raycast points from Screen Space onto a Plane.

References

Table of Content

Input Actions

  • Install the Input System Package and create an Input Action asset.
  • Define an action for Move with action type Button and interaction Press.
  • Add a Player Input component to the Game Object, and set its behavior to Invoke Unity Events.
  • Bind the events to OnMoveAction and OnPointerPosition

Picture Picture Picture

Raycast

  • If isMoving use the value coming from the PointerPosition action, and use it as a Screen Position vector.
  • Use Camera.ScreenPointToRay to obtain a ray and raycast it onto the plane.
  • Move the player to the hit transform position.
1private Camera mainCamera;
2private LayerMask raycastLayerMask;
3private float raycastMaxDistance = 40;
4private bool isMoving = false;
5
6public void OnMoveAction(InputAction.CallbackContext context)
7{
8    isMoving = context.performed;
9}
10
11public void OnPointerPosition(InputAction.CallbackContext context)
12{
13    if (!isMoving)
14    {
15        return;
16    }
17
18    var point = context.ReadValue<Vector2>();
19    var ray = mainCamera.ScreenPointToRay(point);
20    RaycastHit hit;
21
22    if (
23        Physics.Raycast(
24            ray,
25            out hit,
26            raycastMaxDistance,
27            raycastLayerMask,
28            QueryTriggerInteraction.Collide
29        )
30    )
31    {
32        transform.position = hit.point;
33    }
34}

Picture